<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>购物车</title>
    <style>
      thead {
        background-color: #f5f5f5;
      }
      th,
      td {
        border: 1px solid #aaa;
        padding: 8px 12px;
        text-align: center;
      }
    </style>
  </head>
  <body>
    <table>
      <thead>
        <tr>
          <th>编号</th>
          <th>书籍名称</th>
          <th>出版日期</th>
          <th>价格</th>
          <th>购买数量</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody></tbody>
    </table>
    <h2 class="price">总价格:¥<span class="price-count">0</span></h2>
    <script>
      //1.先拿到数据
      let books = [
        {
          id: 1,
          name: '《算法导论》',
          date: '2006-09',
          price: 85.0,
          count: 3,
        },
        {
          id: 2,
          name: '《UNIX编程艺术》',
          date: '2006-02',
          price: 59.0,
          count: 2,
        },
        {
          id: 3,
          name: '《编程珠玑》',
          date: '2008-10',
          price: 39.0,
          count: 5,
        },
        {
          id: 4,
          name: '《代码大全》',
          date: '2006-03',
          price: 128.0,
          count: 8,
        },
      ];

      let tbody = document.querySelector('tbody');
      let del = document.querySelector('.del');
      let pc = document.querySelector('.price-count')
        //给表格添加一整行
        for(let i = 0; i<books.length;i++){
          tbody.innerHTML += `
        <tr>
          <td>${books[i].id}</td>
          <td>${books[i].name}</td>
          <td>${books[i].date}</td>
          <td>${books[i].price}</td>
          <td>${books[i].count}</td>
          <td>
            <button class='delOne'>删除</button>
          </td>
        </tr>
        `;
        pc.innerHTML = Number(pc.innerHTML)+books[i].price*books[i].count
        }
        // 
        tbody.addEventListener('click', (e) => {
        if (e.target.className === 'delOne') {
          e.target.parentNode.parentNode.remove();
        }
        let newOne = document.querySelectorAll('tbody>tr')
        let arr = []
        newOne.forEach(function(itme,index ){
          arr.push(itme);
          
        })
        pc.innerHTML = arr.reduce(function(k,itme){
          return k += itme.children[3].textContent*itme.children[4].textContent
        },0)
    
      });
     
    </script>
  </body>
</html>
